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Updated: Feb 16, 2026

Microsurgical Clip Obliteration of Middle Cerebral Aneurysm Using Intraoperative Flow Assessment
Published on: September 25, 2009
Intracranial aneurysm and arachnoid cyst: just a coincidence? A case report
Guilherme Brasileiro de Aguiar1, Rafael Gomes Dos Santos2, Aline Lariessy Campos Paiva3
1MD, MSc. Attending Neurosurgeon, Faculdade de Ciências Médicas da Santa Casa de São Paulo (FMSCSP), São Paulo (SP), Brazil.
Context:
Presence of an arachnoid cyst and a non-ruptured intracystic brain aneurysm is extremely rare. The aim of this paper was to describe a case of a patient with an arachnoid cyst and a non-ruptured aneurysm inside it. Clinical, surgical and radiological data were analyzed and the literature was reviewed.
Case Report:
A patient complained of chronic headache. She was diagnosed as having a temporal arachnoid cyst and a non-ruptured middle cerebral artery aneurysm inside it. Surgery was performed to clip the aneurysm and fenestrate the cyst.
Conclusions:
This report raises awareness about the importance of intracranial vascular investigation in patients with arachnoid cysts and brain hemorrhage.
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